The grappler stops the concentrate on from shifting (in the situation of something similar to a wrestling pin) or resists their efforts to maneuver (like pulling the focus on back again every time they try to move). list of added, perhaps relevant resources starting on p. sixty one of Xanathar's https://www.consult-exp.com/blogs/190725/This-Enjoyment-connected-with-Dice-Games-Some-sort-of-Blend